Local coordination geometry perturbed β-diketone dysprosium single-ion magnets

Area of Science:

• Coordination Chemistry
• Materials Science
• Magnetism

Background:

• Dysprosium complexes are investigated for their magnetic properties.
• Single-ion magnets (SIMs) are crucial for future data storage technologies.
• β-diketone ligands offer versatile coordination environments for lanthanide ions.

Purpose of the Study:

• To design and synthesize novel mononuclear dysprosium complexes.
• To investigate the structural and magnetic properties of these complexes.
• To explore their potential as single-ion magnets.

Main Methods:

• Synthesis of three β-diketone dysprosium complexes: Dy(TFI)3(H2O)2 (1), Dy(TFI)3(bpy) (2), and [Dy(TFI)3(Phen)]·0.02CHCl3 (3).
• Crystal structure analysis to determine coordination geometry and symmetry.
• Magnetic studies including SQUID magnetometry to probe magnetic relaxation and hysteresis.

Main Results:

• Complexes 1-3 possess isomorphic structures with the Dy(III) ion in an eight-coordinated environment.
• Complexes 2 (D(2d) symmetry) and 3 (D(4d) symmetry) exhibit slow magnetic relaxation.
• Complex 3 shows a significantly longer relaxation time (0.0258 s) and magnetic hysteresis at 1.8 K compared to complex 2.

Conclusions:

• The synthesized dysprosium complexes demonstrate tunable magnetic properties based on ligand choice and coordination geometry.
• Complexes 2 and 3 represent promising candidates for single-ion magnet applications.
• The findings contribute to the development of advanced molecular magnetic materials.